Communication method and system for power line carrier and wireless dual-mode fusion

Abstract

The invention relates to the technical field of communication methods for power line carrier and wireless dual-mode fusion, and provides a communication method and system for power line carrier and wireless dual-mode fusion, and the method comprises the steps: building a dual-mode physical platform, dividing channels for all services, and carrying out the channel division; continuously evaluating the condition of the dual-mode link; instantaneous switching is carried out, and continuous transmission of interrupted services is ensured; queue jumping locking and task priority improvement are carried out, firstly, a dual-mode physical platform is built, channels are divided for all services, channel division is carried out, then the health conditions of two links are evaluated by continuously evaluating the dual-mode link condition, and then an appropriate route is instantly switched, so that it is guaranteed that an emergency command can be notified at the first time. When the low-level commands are queued, queue jumping is prevented, and timely transmission of the low-level commands is guaranteed by improving the priorities of the low-level commands.

Description

Technical Field

[0001] The present invention relates to the field of communication methods for integrating power line carrier and wireless dual modes, and in particular to a communication method and system for integrating power line carrier and wireless dual modes. Background Art

[0002] Power line carrier communication uses existing power lines as a transmission medium, superimposing data signals on low-frequency or high-frequency carriers for transmission, without the need for additional wiring, wireless communication, and transmitting information in the air through electromagnetic waves. The Chinese publication number is CN115514437B, which discloses a configuration method, a configuration device, and a dual-mode communication fusion system. The configuration method includes: determining a first operating frequency band for power line carrier communication and a second operating frequency band for micropower wireless communication; configuring a second frequency band number for the second operating frequency band according to the first frequency band number of the first operating frequency band, so that the higher harmonic frequencies of the first operating clock of the power line carrier communication and the second operating clock of the micropower wireless communication do not overlap with the first operating frequency band and the second operating frequency band. In this way, the influence of the multiplication noise generated by the superposition of harmonics can be reduced, and the influence of the noise generated by the operation of the central processing unit on the performance of the dual-mode communication unit can be reduced, thereby improving the transmission efficiency of the dual-mode communication; In smart buildings, although the integration of power line carrier and wireless dual-mode solves the problem of insufficient coverage or bandwidth of a single link, the existing technology classifies security videos and fire alarm commands as high priority without making more detailed classifications. As a result, fire alarm commands, which are also "high priority", have to be queued in the same queue as continuous high-definition video streams and cannot pass first. When the video stream continuously occupies bandwidth, the fire alarm command can only be sent after the current video frame is transmitted. This "first-come, first-served" scheduling does not reserve a dedicated channel for fire alarm commands, which can easily cause alarm delays. Summary of the Invention

[0003] The purpose of the present invention is to provide a communication method that integrates power line carrier and wireless dual-mode to solve the problem that fire alarm commands, which are both "high priority", have to be queued in the same queue as continuous high-definition video streams and cannot pass first. When the video stream continuously occupies bandwidth, the fire alarm command can only be sent after the current video frame is transmitted. This "first-come, first-served" scheduling does not reserve a dedicated channel for fire alarm commands, which is very likely to cause alarm delays.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve: a communication method integrating power line carrier and wireless dual mode, Build a dual-mode physical platform and divide and segment channels for each service; Continuously evaluate the dual-mode link status; Instantaneous switching and ensuring continuous transmission of interrupted services; Queue-jumping lock and increase task priority As a preferred embodiment, the specific steps of building the dual-mode physical platform are as follows: Integrate the PLC module and wireless RF module into the same chip; Chips are set on the terminal and the central gateway respectively; Each chip is equipped with an independent antenna and filter; And use time division multiplexing and frequency division multiplexing technology to mobilize the transmission of data between the two modules; The business divisions are specifically divided into 4 levels, which can be emergency level 1, emergency level 2, emergency level 3 and emergency level 4; The channel division is specifically as follows: Emergency 2nd, 3rd and 4th gears are marked and designated to use the PLC carrier link; Emergency Level 1 marks and designates wireless links, and reserves 10% of the bandwidth on the wireless links for exclusive use in Emergency Level 1. The specific steps for evaluating the dual-mode link status are as follows: Deploy small hardware at each PLC access point to capture the signal-to-noise ratio and packet loss rate; Probes are set up in the wireless module and gateway to collect received signal strength and round-trip delay; The signal is collected periodically and the data is smoothed; Set upper and lower thresholds for the collected data and then perform evaluation.

[0005] As a preferred embodiment, the instantaneous switching specifically comprises the following steps: The system determines whether the emergency level 1 is reached and whether the current link needs to be preempted.

[0006] As a preferred embodiment, the instantaneous switching specific steps also include: the determination formula is , where is the trigger coefficient, is the priority of the task, is the link health weight coefficient, Respectively represent the health of the PLC link and the wireless link; when >1, seize the current link transmission emergency level, when When ≤1, continue the current link processing task; When the PLC carrier link data transmission is interrupted, the currently transmitted task data is stored in the local cache queue and the interruption offset is recorded. The calculation formula of the offset is: , where L is the position of the current frame of data, It is the serial number or timestamp of the current PLC transmission frame.

[0007] As a preferred embodiment, the instantaneous switching specific steps further include: when the emergency first gear is transmitted through the wireless link, calculating the priority of the wireless link , where is the priority utility, is the sum of all task priority utilities, Respectively represent the health of the PLC link and the wireless link, is the link health weight coefficient, when >1, the system considers the current line to be healthy. When ≤1, the current link status is unhealthy; After the emergency first gear transmission is completed, the interrupted PLC data transmission is resumed.

[0008] As a preferred implementation, the specific steps of queue-jumping locking are: After the emergency first gear transmission is completed, the system locks the window; The calculation formula of the lock window is: , where is the duration of the lock window, Is the basic lock duration, is the link health weight coefficient, Priority The variance reflects fluctuations.

[0009] As a preferred embodiment, the specific steps of the queue locking further include: when the task is in the queue, the task queue is upgraded and the upgrade formula is: , where w is the task waiting time, The turning point of aging, Parameters that control the aging rate, It adjusts the priority of the task through the exponential function.

[0010] A power line carrier and wireless dual-mode integrated communication system is configured by adopting a power line carrier and wireless dual-mode integrated communication method.

[0011] The beneficial effects of the present invention are: 1. First, by building a dual-mode physical platform and dividing channels for each business, and then continuously evaluating the dual-mode link status and the health of the two links, and then instantly switching to the appropriate route to ensure that emergency commands can be notified in the first time.

[0012] 2. When low-level commands are queued, prevent them from being interrupted all the time by increasing their priority to ensure timely transmission.

[0013] Legend Figure 1 The present invention is a flow chart of a communication method and system integrating power line carrier and wireless dual-mode. DETAILED DESCRIPTION

[0014] In order to make the technical means, creative features, purpose and efficacy of the present invention easy to understand, the present invention is further described below in conjunction with specific examples, but the following examples are only preferred embodiments of the present invention, not all. Based on the examples in the embodiments, other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention. The experimental methods in the following examples, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial channels.

[0015] Example 1 A communication method for integrating power line carrier and wireless dual-mode, building a dual-mode physical platform, and dividing channels for each service and performing channel division, wherein the specific steps of building the dual-mode physical platform are: integrating the PLC module and the wireless RF module in the same chip, setting chips on the terminal (camera, fire detector, lighting controller, environmental sensor) and the central gateway respectively, and reserving the PLC modem interface and antenna interface respectively, equipping each chip with an independent antenna and filter, and using time division multiplexing and frequency division multiplexing technology to mobilize the transmission of data from the two modules. The specific division of each service is to divide the service into 4 levels, which can be specifically emergency level 1 for emergency needs such as fire Alarm and emergency level 2 are critical image frames for security or important monitoring, requiring high bandwidth and low latency. Emergency level 3 is for routine surveillance video and general control instructions, with medium bandwidth requirements. Emergency level 4 is for small-scale periodic data such as environmental monitoring and energy meter reading, which requires high tolerance. Channels are generally divided as follows: Emergency level 2, Emergency level 3, and Emergency level 4 are marked and designated to use the PLC carrier link; Emergency level 1 is marked and designated to use the wireless link, with 10% of the bandwidth reserved on the wireless link for exclusive use. Emergency level 1 is the most important task in the system, and its transmission needs to have the highest priority. By reserving a certain amount of bandwidth on the wireless link, transmission can be guaranteed even when other network loads are high. Based on the above channel division, when the wireless link is interrupted, the emergency first gear will be transferred to the PLC carrier link for transmission to ensure that the emergency first gear can be transmitted.

[0016] Based on the above steps, it should be noted that continuous evaluation of the dual-mode link status has been added, small hardware is deployed at each PLC access point, the signal-to-noise ratio is captured to mainly reflect the quality of the power line signal, and the packet loss rate mainly reflects the transmission stability of the link. Probes are set in the wireless module and gateway to collect the received signal strength to mainly reflect the signal coverage strength and the round-trip delay mainly reflects the delay performance of the wireless link; the signal is collected periodically, such as once every 100ms to ensure sufficient real-time performance, while avoiding the system burden caused by frequent sampling, and the data is smoothed to filter out instantaneous noise or interference to ensure that the health assessment is more stable and accurate; upper and lower thresholds are set for the collected data, for example, the SNR lower limit is 10dB, a too low signal-to-noise ratio indicates poor link quality, the packet loss rate upper limit is 1%, when it is higher than 1%, it means that the network quality may be very poor, the upper limit of the received signal strength is -40dBm, the lower limit is -85dBm, the lower limit of the delay is 5ms, and the upper limit is 100ms. The formula for smoothing is: , where is the smoothed data value, The i-th value in the original data, H is the size of the sliding window, t is the current time, t-N+1 is the starting time of the sliding window, and then evaluation is performed; Based on the above steps, instantaneous switching is also added to ensure the continuous transmission of interrupted services. The steps are as follows: the system determines whether the emergency level 1 is reached and whether the current link needs to be preempted. The judgment formula is: , where is the trigger coefficient, is the priority of the task, is the link health weight coefficient, Respectively represent the health of the PLC link and the wireless link; when >1, seize the current link transmission emergency level, when When ≤1, the current link processing task continues. When the PLC carrier link data transmission is interrupted, the currently transmitted task data is stored in the local cache queue and the interruption offset is recorded. The calculation formula of the offset is: , where L is the position of the current frame of data, It is the serial number or timestamp of the current PLC transmission frame. By recording the offset, it ensures accurate docking when data is recovered to avoid frame loss. When the emergency first gear is transmitted through the wireless link, the priority of the wireless link is calculated. , where is the priority utility, is the sum of all task priority utilities, Respectively represent the health of the PLC link and the wireless link, is the link health weight coefficient, when >1, the system considers the current line to be healthy. When ≤1, the current link status is unhealthy. After the emergency transmission is completed, the interrupted PLC data transmission is resumed. Although the emergency transmission is performed over the wireless link by default, in some cases (such as when the distance is too far, or the signal is easily shielded or attenuated by building walls, metal objects, etc.), the wireless link cannot meet the requirements of the emergency transmission. The system will evaluate the health status of the current PLC carrier link. If the PLC link is more stable than the wireless link, the system will make adjustments to give priority to the emergency transmission task, thereby interrupting other tasks.

[0017] The above steps can solve the problem of giving priority to the emergency first file, but there will still be a priority inversion problem. That is, after the high-level command cuts in line with the lowest priority command, the medium-priority command cuts in line with the lowest priority command, causing the lowest priority command to be stuck. Therefore, it is proposed to lock the queue and increase the task priority. The specific steps are: after the emergency first file transmission is completed, the system locks the window; the calculation formula of the lock window is: , where is the duration of the lock window, Is the basic lock duration, is the link health weight coefficient, Priority The variance reflects When the task is in the queue, it is upgraded by the task queue upgrade, and the upgrade formula is: , where w is the task waiting time, For the aging turning point, wait for more than this time to start upgrading the priority, Parameters that control the aging rate, The priority of the task is adjusted through an exponential function. The growth of the exponential means that the longer the task waits, the faster the priority is increased. By adjusting the priority of the task, the priority is increased. Here, the setting is: waiting time is less than 0.5s: priority is increased by 0; waiting time is between 0.5s and 1s: priority is increased by 0.3; waiting time is between 1s and 2s: priority is increased by 0.6; waiting time is greater than 2s: priority is increased by 1. For example: suppose the emergency third gear is waiting in the queue, and the waiting time is 0.5s. As time increases , so the priority is increased by 0.3. The aging parameter in the formula is set by human experience.

[0018] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A communication method integrating power line carrier and wireless dual-mode communication, characterized in that: Build a dual-mode physical platform and divide and segment channels for each service; Continuously evaluate the dual-mode link status; Instantaneous switching and ensuring continuous transmission of interrupted services; Jump the queue to lock and increase the task priority.

2. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: The specific steps of building the dual-mode physical platform are: Integrate the PLC module and wireless RF module into the same chip; Chips are set on the terminal and the central gateway respectively; Each chip is equipped with an independent antenna and filter; And use time division multiplexing and frequency division multiplexing technology to mobilize the transmission of data between the two modules; The business divisions are specifically divided into 4 levels, which can be emergency level 1, emergency level 2, emergency level 3 and emergency level 4; The channel division is specifically as follows: Emergency 2nd, 3rd and 4th gears are marked and designated to use the PLC carrier link; The first emergency level is marked and designated to use the wireless link, and 10% of the bandwidth on the wireless link is reserved for the first emergency level.

3. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: The specific steps of evaluating the dual-mode link status are: Deploy small hardware at each PLC access point to capture the signal-to-noise ratio and packet loss rate; Probes are set up in the wireless module and gateway to collect received signal strength and round-trip delay; The signal is collected periodically and the data is smoothed; Set upper and lower thresholds for the collected data and then perform evaluation.

4. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: The specific steps of instantaneous switching are: The system determines whether the emergency level 1 is reached and whether the current link needs to be preempted.

5. The communication method of power line carrier and wireless dual-mode fusion according to claim 4, characterized in that: The instantaneous switching specific steps also include: the judgment formula is , where is the trigger coefficient, is the priority of the task, is the link health weight coefficient, Respectively represent the health of the PLC link and the wireless link; when >1, seize the current link transmission emergency level, when When ≤1, continue the current link processing task; When the PLC carrier link data transmission is interrupted, the currently transmitted task data is stored in the local cache queue and the interruption offset is recorded. The calculation formula of the offset is: , where L is the position of the current frame of data, It is the serial number or timestamp of the current PLC transmission frame.

6. The communication method of power line carrier and wireless dual-mode fusion according to claim 5, characterized in that: The instantaneous switching specific steps also include: when the emergency first gear is transmitted through the wireless link, calculating the priority of the wireless link , where is the utility of priority, is the sum of all task priority utilities, Respectively represent the health of the PLC link and the wireless link, is the link health weight coefficient, when >1, the system considers the current line to be healthy. When ≤1, the current link status is unhealthy; After the emergency first gear transmission is completed, the interrupted PLC data transmission is resumed.

7. The communication method of power line carrier and wireless dual-mode fusion according to claim 1, characterized in that: The specific steps of the queue-jumping lock are: After the emergency first gear transmission is completed, the system locks the window; The calculation formula of the lock window is: , where is the duration of the lock window, Is the basic lock duration, is the link health weight coefficient, Priority The variance reflects fluctuations.

8. The communication method of power line carrier and wireless dual-mode fusion according to claim 9, characterized in that: The specific steps of the queue locking also include: when the task is in the queue, the task queue is upgraded and the upgrade formula is: , where w is the task waiting time, The turning point of aging, Parameters that control the aging rate, It adjusts the priority of the task through the exponential function.

9. A power line carrier and wireless dual-mode integrated communication system, characterized by: The power line carrier and wireless dual-mode integrated communication system is configured by adopting any one of the power line carrier and wireless dual-mode integrated communication methods in claims 1-8.

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